在 Linux 平台中调试 C/C++ 内存泄漏方法

ps -aux
  

                
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int LeakTest(char * Para)
{
        if(NULL==Para){
                //local_log("LeakTest Func: empty parameter\n");
                return -1;
        }
        char * Logmsg = new char[128];
        if(NULL == Logmsg){
                //local_log("memeory allocation failed\n");
                return -2;
        }
        sprintf(Logmsg,"LeakTest routine exit: '%s'.\n", Para);
        //local_log(Logmsg);
        return 0;
}
int   main(int argc,char **argv )
{
        char szInit [] = "testcase1";
        LeakTest(szInit);
        return 0;
}
  

                
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int *p;

void
foo(int a)
{
  int b, c;

  b = 0;
  if(!p) 
    c = 1;

  if(c > a)
    c += p[1];
}

int LeakTest(char * Para)
{
        char * Logmsg = new char[128];
        if((Para==NULL)||(Logmsg == NULL))
                return -1;        
        sprintf(Logmsg,"LeakTest routine exit: '%s'.\n", Para);        
        return 0;
}

int   main(int argc,char **argv )
{
        char szInit [] = "testcase1";
        LeakTest(szInit);
        return 0;
}
  

./beam-3.4.2/bin/beam_configure  --c gcc
./beam-3.4.2/bin/beam_configure  --cpp g++
./beam-3.4.2/bin/beam_compile  --beam::compiler=compiler_cpp_config.tcl  -cpp code2.cpp
  

"code2.cpp", line 10: warning: variable "b" was set but never used
    int b, c;
        ^

BEAM_VERSION=3.4.2
BEAM_ROOT=/home/hanzb/memdetect
BEAM_DIRECTORY_WRITE_INNOCENTS=
BEAM_DIRECTORY_WRITE_ERRORS=

-- ERROR23(heap_memory)     /*memory leak*/     >>>ERROR23_LeakTest_7b00071dc5cbb458
"code2.cpp", line 24: memory leak
ONE POSSIBLE PATH LEADING TO THE ERROR:
 "code2.cpp", line 22: allocating using `operator new[]' (this memory will not be freed)
 "code2.cpp", line 22: assigning into `Logmsg'
 "code2.cpp", line 24: deallocating `Logmsg' because exiting its scope 
                       (losing last pointer to the memory)

-- ERROR1     /*uninitialized*/     >>>ERROR1_foo_60c7889b2b608
"code2.cpp", line 16: uninitialized `c'
ONE POSSIBLE PATH LEADING TO THE ERROR:
 "code2.cpp", line 10: allocating `c'
 "code2.cpp", line 13: the if-condition is false
 "code2.cpp", line 16: getting the value of `c'

 VALUES AT THE END OF THE PATH:
  p != 0 


-- ERROR2     /*operating on NULL*/     >>>ERROR2_foo_af57809a2b615
"code2.cpp", line 17: invalid operation involving NULL pointer
ONE POSSIBLE PATH LEADING TO THE ERROR:
 "code2.cpp", line 13: the if-condition is true (used as evidence that error is possible)
 "code2.cpp", line 16: the if-condition is true
 "code2.cpp", line 17: invalid operation `[]' involving NULL pointer `p'

 VALUES AT THE END OF THE PATH:
  c = 1 
  p = 0 
  a <= 0
  

CC=purify gcc
  

./purifyplus_setup.sh
  

purify g++ -g test3.cpp –o test
  

./test
  

                
#include <unistd.h> 
 char * Logmsg;

int LeakTest(char * Para)
{
        if(NULL==Para){
                //local_log("LeakTest Func: empty parameter\n");
                return -1;
        }
        Logmsg = new char[128];
		for (int i = 0 ; i < 128; i++)
			Logmsg[i] = i%64;

        if(NULL == Logmsg){
                //local_log("memeory allocation failed\n");
                return -2;
        }
        sprintf(Logmsg,"LeakTest routine exit: '%s'.\n", Para);
        //local_log(Logmsg);
        return 0;
}

int   main(int argc,char **argv )
{
        char szInit [] = "testcase1";
		int i;
         LeakTest(szInit);
		for (i=0; i < 2; i++){
			if(i%200 == 0)
				LeakTest(szInit);
			sleep(1);
		}        
        return 0;
}